Flame diffuser insert for immersion tube furnace



FIG. 1 includes a perspective view of a flame diffuser insert;

FIG. 2 includes a bottom elevation view of the flame diffuser insert of FIG. 1;

FIG. 3 includes a side elevation view of the flame diffuser insert of FIG. 1; and,

FIG. 4 includes a top elevation view of the flame diffuser insert of FIG. 1.

The broken lines shown in FIGS. 1, 2, 3, and 4 are for the purpose of depicting portions of the flame diffuser insert and form no part of the claimed design. 

CLAIM The ornamental design for a flame diffuser insert for an immersion tube furnace, as shown and described. 